[Zuvio]

Well, they are similar in many ways, including atmosphere and psychology involved. However, this one is way scarier than the Ring. The Ring is more like a detective story, trying to find out what the hell is going one and The Grudge is on a killing spree. The Grudge also features a back-and-forth timeline, like Memento. Not as sofisticated though. The Ring is just cool because of the cool video and The Grudge will keep you on the edge of your seat. Both are a must see. On a side note: The Grudge is more scarier done than Ju-on, but Ju-on has more scenes. See for yourself.